Improvement in screw-threading maqhines



N- PEYERS. PHOTOAUTHOGHAPNER, WASHINGTON. D. c.

Sdu

WILLIAM J. LEWIS, OF PITTSBURG, PENNSYLVANIA.

Letters Patent No. 88,882, dated April 13, 1869.

IMPROVEMENT IN SCREW-THREADING- MACHINES.

-The Schedule referred to in these Letters Patent and making part of the nm.

To all whom it fina/y concern:

:opening and closing the cutting-dies, and also for regi11ating the length of cut, or thread on the screw, or bolt.

My invention also consists in providing a screwcutting machine with a screw, or bolt-holder, consisting of an adjustable disk, gauge, and sliding head.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

In the accompanying drawings, which form part of my specification- Figure 1, sheet A, is a side-elevation of my improvement in screw-cutting machines.

Figure 2, sheet `B,'is a top view, or plan of the same.

Figure 3, sheet C, is a vertical section of the same, when cut through at line 2 of fig. 2.

In the drawings- A represents the frame of the machine.

B represents a sink, or oil-reservoir, in which are two sets of slides, t.

Between the slides of each pair are ratchet-teeth,

which are used in connection with the lever l?, connected to the feed-head k, which is provided with two grooves, which are fitted to the slides t.

The frame A, which supports the running-gear of the machine, and the sink, or oil-reservoir B, are secured to and rest on legs, y. Y

The feed-head 7c is provided with a bolt-holder, fi, which is a disk, with a series of notches made in its periphery, which notches in form and size should correspond to the size and form of the neck of the screws, or bolts to be held by said disk.

The disk 'i is held in the desired position on the feed-head k, by means of a set-screw, J, which passes through an opening in the feed-head, which opening is of greater diameter than the set-screw J, so that the position of the set-screw J may be varied, and the relation of the disk a, varied to suit any variation that maybe in thesize of the screws, or bolts to be cut, it being important to have the central plane of the blank-screw,or bolt come midway between the dies h of the cutting-head R.

The feed-head k is provided with a gauge, m', which is held in the desired position by means of the setscrew l2. l

The gauge m is used for the purpose of holding the head of the blank-screw, or bolt against the disk'fi.

The cutting-head R is secured on the inner end of the hollow shaft f, and is provided with die-holders, g, which are pivoted at 21 in recesses made in the cutting-head R.

To the front end of the die-holders g are secured, by means of screws, 1 and 2, the cutting-dies h, for forming the screw-thread on the screw, or bolt.

The back end of the die-holders gare provided with projections, 9, the ends of which are held down on the cone 4 by means of springs, u, which press on the pins 6, which project through openings'in the sides of the cutting-head R', (figs. 3 and 4.) y

The cone 4 is provided with screw-threads, and is placed on the screw o of the rod n, placed in the hollow shaft f.

The cone 4 moves back and forward in the space m of the shaft f, and is prevented from turning by means of a feathen 3, which works in a recessmade for it in the shaft f The rod n is connected to the yoke x by means of the sleeve 7 vand set-screw 8, and to the yoke x is also connected the rod x, which moves in the guides l of the frame A, and guide, l, of the feed-head k.

The rod a: is provided with a ring, s, which is held in the desired position on the rod by means of a set- .screw, 4.

The shaft on which the cone-pulley c is placed is provided with a small gear-wheel, D, which gears into the wheels c on the hollow shafts f.

The skilful mechanic will, from the foregoing description, and by reference to the accompanying drawings, readily understand the construction and arrangement of the several parts of myimprovement, and the relation that said parts bear to each other. I will, therefore, proceed, without further description of the construction, and describe the operation of my improvement, which is as follows:

Having the various parts arranged and set for cutting the desired size of screw, or boit, the neck of the bolt to be cut is placed in a notch inthe disk i. Then, by means of the lever P, the feed-head Ic is forced up to the cutting-head R', sothat the point ofthe bolt will enter between the cutting-dies h, which, being rotated, will cut the screw-threads on the bolt, drawing it and the feed-head forward until the point'of the bolt comes in contact with the end of the screw o of rod n, which is forced hack by the boltl being out, and the back motion of the rod n will move back the cone 4 from under the projections 9 of the die-holders g, and the springs u, acting on the pins', will throw open the dies. The feed-head k is then drawn back,and the guide l1, coming in contact with the ring s, will bring forward the cone 4,-which will close the dies h ready for cutting screw-threads on another bolt.

Another of the rings s may be placed on the rod forward ofthe guide Z, for the purpose of imparting a reciprocating motion to the rods x and n, for opening and closing the cutting-dies.

Having thus described the nature, construction, and operation of my improvement,y

What I claim as of my invention, is

l. The arrangement of the rod n., screw o, cone 4,' and the hollow shaft f, with the die-holders g, as herein described.

2. The improved feed-head, consisting ofthe rotating and notched disk i, adjustable gauge m, and slid- .ing head 7c, all constructed, arranged, and operating substantially as herein described, and for the purpose set forth. l

3. 'The arrangement of rod :c with ring, or rings S', and connecting-piece the rod n with screw o, and cone 4, and the guide Z of the feed-head, as herein described, and lfor the purpose set forth.

WM. J. LEWIS.

Witnesses:

JAMES J. JOHNSTON, A. O. JOHNSTON. 

